205results about How to "Fine grain structure" patented technology

A method is provided for depositing a hard wear resistant surface onto a porous or non-porous base material of a medical implant. The wear resistant surface of the medical implant device may be formed by a Laser Based Metal Deposition (LBMD) method such as Laser Engineered Net Shaping (LENS). The wear resistant surface may include a blend of multiple different biocompatible materials. Further, functionally graded layers of biocompatible materials may be used to form the wear resistant surface. Usage of a porous material for the base may promote bone ingrowth to allow the implant to fuse strongly with the bone of a host patient. The hard wear resistant surface provides device longevity, particularly when applied to bearing surfaces such as artificial joint bearing surfaces or a dental implant bearing surfaces.

The invention provides a method for preparing a nano oxide dispersion reinforced superfine crystal tungsten-based composite material. The method comprises the following steps of: taking 0.1 to 1 weight percent of micro tungsten powder, nano yttrium oxide powder or yttrium metal powder and 0 to 2 weight percent of titanium metal powder or molybdenum powder or tantalum powder, blending the materials, mechanically alloying the materials, sintering discharge plasma and the like to prepare the superfine crystal tungsten composite material. The method has the following advantage that: the nearly full-densification superfine crystal tungsten-based composite material can be obtained by the method for preparing the nano oxide dispersion reinforced superfine crystal tungsten-based composite material. Complex phase doping of yttrium oxide or yttrium metal and titanium metal, molybdenum or tantalum powder not only realizes sintering densification of tungsten at a lower temperature, but also inhibits grain growth of tungsten crystals during sintering. The tungsten crystal grain size of the yttrium oxide reinforced superfine crystal tungsten-based composite material prepared by adopting the method is less than or equal to 3 microns, and the composite material has good mechanical property and thermal shock resistance.

The invention relates to the field of powder metallurgy technology characterized in that, forming the powder with 200 MPa-500 MPa and feeding into sintering furnace, elevating the temperature to 400-700 deg. C. at the speed of 5-20 deg. C per minutes, heat preserving for 15-120 mins, elevating the temperature to sintering temperature of 1150-1350 deg. C. at the speed of 20-60 deg. C per minutes, heat preserving for 30-120 mins.

This invention discloses a Cu alloy contact wire of high strength and high conductivity used in high speed railways and its preparation method, in which, the contact wire is taken Cu as the matrix to be added with Ag: 0-0.15% and Cr: 0.20-0.72%. The preparation method includes: applying a hot-rolling technology to large area Cu alloys and level conticasting technology to produce large length wires or a rod ingot is solutionized then to be rolled, aged and rolled.

The invention belongs to the technical field of preparation of aluminum alloy sections, and relates to a wide-range thin-wall series-6 aluminum alloy section for a high speed train and a preparation method of the wide-range thin-wall series-6 aluminum alloy section. Aluminum alloy comprises the following elements in percentages by weight: 0.50-0.65% of Si, less than or equal to 0.25% of Fe, less than or equal to 0.10% of Cu, 0.03-0.15% of Mn, 0.45-0.55% of Mg, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.10% of Ti, less than or equal to 0.05% ofa single impurity, less than or equal to 0.15% of total impurities and the balance of Al. Deformation resistance and friction resistance in an extruding process are reduced by reasonably controllingthe temperature relationship of an ingot casting, an extrusion barrel and a die, the extruding speed is increased to be 8-13 m/min, the quenching temperature of the product is ensured, thus, any coarse grain rings are not generated when a thin-walled apron board is extruded at high speed, after being subjected to on-line quenching, the product is directly subjected to artificial ageing at the temperature of 175+/- 5 DEG C for 4-8 hours, the mechanical property of the product can meet requirements in TB/T.3260.4-2011 TO 1.2 mm thin-walled sections, the actual tensile strength reaches 250-270 MPa, the yield strength reaches 210-230 MPa, the specific elongation is 8-10%, and the grade of the grain size of an aluminum section microscopic structure reaches and even exceeds 4.

The present invention provides a high cerium content ruthenium coating contained titanium anode preparation method. Said ruthenium coating containing titanium anode includes titanium basal body, featuring said titanium basal body surface coating RuO 2 and CeO 2 ratio as 1 : 3-3 :1.Said preparation method includes using RuCl 3 H2 O, Ce(No3)3 as source substance, including titanium base preprocessing, unit coating liquid preparation, multielement coating liquid preparation and coating preparation. The present invention has simple technology, convenient operating, fine coated grain structure, and low chlorine separating potential.

A RE oxide doped fine-crystal Mo-alloy is prepared from MoO2 through doping RE oxide by atomizing method, ball grinding, sieving, reducing in H2 atmosphere in muffle furnace at 800-1100 deg.C, cold isostatic pressing under 150-200 MPa for shaping, segmental sintering in MF induction furnace and mechanical deforming to obtain rod or plate. It has high strength, ductility and toughness.

The invention relates to a hydraulic extruding method for producing magnesium alloy wire or rod, and relative specific extruding mould, which can avoid crack and high cost or the like. The inventive method comprises that processing magnesium alloy blank, coating lubricant, and heating with era oil, heating hydraulic extruding mould and controlling temperature, arranging magnesium alloy blank, filling era oil, arranging movable convex mould, pressurizing and extruding. The inventive mould comprises a movable convex mould (26), under a convex mould (6) and coaxial with the convex mould (6), wherein the lower end of the convex mould (26) is through a convex mould through hole (8) at the middle of a convex mould press plate (17) to be mounted on the upper part of an extruding barrel (13), and the extruding barrel (13) is a multilayer cold press extruding one. The invention can obtain better physical property and surface quality, or the like.

The invention discloses an auxiliary rolling method of a magnesium alloy plate, comprising the following step: side-surface predeformation in which rolling pretreatment is carried out on the side surfaces of a magnesium alloy hot-rolling plate blank by a side-surface predeformation technique along the transverse direction or the rolling direction of the plate blank. The plate blank adopts the side-surface predeformation, the texture of the base surface of the material is weakened, the single-pass rolling deformation amount is obviously improved in the processing of subsequent rolling, the rolling molding performance of the plate blank is improved, the rolling pass and the intermediate annealing times are reduced, the processing cost of the magnesium alloy thin plate is obviously reduced, and the reasonable control of the quality and the cost of the magnesium alloy thin plate is realized. Simultaneously, the magnesium alloy plate prepared by adopting the technique has uniform and fine grain structures and excellent mechanical performance. The invention also discloses a rolling method of the magnesium alloy plate, comprising the steps: side-surface predeformation and flat-rolling molding, in the side-surface predeformation, predeformation treatment is carried out on a magnesium alloy hot-rolling plate blank from two sides; and in the flat-rolling molding, flat-rolling molding is carried out on semi-finished products of the plate blank in the range from room temperature to 400 DEG C, so as to manufacture the magnesium alloy plate.

the invention discloses a Ti anode of Ir coating layer with high-oxygen active high- Ce content at 1:3-3:1 for IrO2:CeO2, which comprises the following steps: adopting H2IrO6 and Ce (NO3)3 .6H2O as source material; predisposing Ti base; allocating the coating liquid; preparing coating layer; making CeO2 as electric catalyst carrier material and IrO2 as electric catalyst center.

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a rolling process for improving surface corrosion resistance of 6061 aluminum alloy. The aluminum alloy comprises, by weight, 0.50%-0.65% of Si, less than or equal to 0.2% of Fe, 0.25%-0.35% of Cu, less than or equal to 0.10% of Mn, 0.9%-1.1% of Mg, 0.13%-0.26% of Cr, less than or equal to 0.05% of Ni, less than or equal to 0.04% of Zn, less than or equal to 0.15% of Ti, less than or equal to 0.05% of single impurities while less than or equal to 0.15% of the total impurities, and the balance Al. In the hot rolling procedure, the hot rolling process combining large-deformation rolling and small-deformation temperature control rolling is adopted, a 6061-T651 alloy thick plate with the excellent corrosion resistance is prepared, the grain structure of the plate is fine and uniform, and under the condition that the mechanical property is not lost, the corrosion resistance of the plate in the acidenvironment is greatly improved.

The invention discloses a low-lithium high-plasticity high-strength Mg-Li alloy prepared from the following components in percentage by mass: 4-7% of Li, 2-6% of Al, 0.5-3% of Zn, 0.2-1% of Mn, 0.1-1% of RE, 0-0.05% of Ti+B, less than 0.3% of impurities and the balance of Mg. The invention also discloses a preparation method of an Mg-Li alloy plate. The preparation method comprises the following steps: proportioning, smelting, casting, homogenizing, extruding, rolling and annealing. The Mg-Li alloy related to the invention is relatively low in Li content and relatively high in strength and corrosion resistance; meanwhile, due to the addition of Li, a close-packed hexagonal crystal structure of Mg is changed, the alloy has relatively high plasticity and can be subjected to cold-rolling deformation; and the adopted extrusion rolling process is simple in operation, the finished product rate is relatively high, and the obtained plate has favorable overall performances.

The invention relates to an inducing heating device for a thin steel strip coil and a heat treatment process of the inducing heating device. An expanding bright annealing device is used for carrying out tension-free annealing to the thin steel strip coil, and the residual stress of the annealed product is eliminated. In addition, the heating mode is changed, and the reliability of the annealing device is improved. The temperature uniformity of the thin steel strip coil product is controlled in the temperature range of 2 DEG C, the heat treatment efficiency and the product quality are improved significantly, and a large amount of energy and time is saved. The inducing heating device for the thin steel strip coil comprises a furnace shell, an inducing heating coil, a high-temperature resistant fiber isolation furnace lining, a quartz tube, a graphite lining, a graphite inner cavity, a power supply device, a bracket, a base, a temperature measuring device and a water-cooled cable device. The base is correspondingly arranged below the furnace shell of the inducing heating device. The bracket is arranged in the middle part above the base. The rectangular inducing heating coil on the bracket is arranged in the furnace shell of the inducing heating device and internally provided with the high-temperature resistant fiber isolation furnace lining with a rectangular section.